J/ApJS/201/29 Velocity dispersions in active galaxies (Harris+, 2012)
A local baseline of the black hole mass scaling relations for active galaxies.
II. Measuring stellar velocity dispersion in active galaxies.
Harris C.E., Bennert V.N., Auger M.W., Treu T., Woo J.-H., Malkan M.A.
<Astrophys. J. Suppl. Ser., 201, 29 (2012)>
=2012ApJS..201...29H 2012ApJS..201...29H
ADC_Keywords: Active gal. nuclei ; Velocity dispersion ; Spectroscopy
Keywords: accretion, accretion disks - black hole physics - galaxies: active -
galaxies: evolution - quasars: general
Abstract:
We derive spatially resolved stellar kinematics for a sample of 84 out
of 104 observed local (0.02<z<0.09) galaxies hosting type-1 active
galactic nuclei (AGNs), based on long-slit spectra obtained at the 10m
W. M. Keck-1 Telescope. In addition to providing central stellar
velocity dispersions, we measure major axis rotation curves and
velocity dispersion profiles using three separate wavelength regions,
including the prominent Ca H&K, MgIb, and CaII NIR stellar features.
In this paper, we compare kinematic measurements of stellar velocity
dispersion obtained for different apertures, wavelength regions, and
signal-to-noise ratios, and provide recipes to cross-calibrate the
measurements reducing systematic effects to the level of a few
percent. We also provide simple recipes based on readily observable
quantities such as global colors and Ca H&K equivalent width that will
allow observers of high-redshift AGN hosts to increase the probability
of obtaining reliable stellar kinematic measurements from unresolved
spectra in the region surrounding the Ca H&K lines.
Description:
Objects were observed with the Low Resolution Imaging Spectrometer
(LRIS) at Keck I, on 2009 January 21-22, 2009 April 15-16, 2009
September 20, 2010 January 14-15 and 2010 March 14-15.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 103 Sample observation and FeII information
table2.dat 31 84 Velocity dispersion (σ) measurements
table3.dat 62 591 Spatially resolved σ measurements
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/ApJ/708/137 : Broad-line AGNs in zCOSMOS survey (Merloni+, 2010)
J/ApJS/183/1 : Catalog of central stellar velocity dispersions (Ho+, 2009)
J/AJ/135/928 : The black hole-bulge relationship (Shen+, 2008)
J/ApJ/641/L21 : Black hole mass and velocity dispersion relation (Greene+,
2006)
J/ApJ/585/647 : Velocity dispersion in AGN (Boroson, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Target name (HHMM+DDMM; J2000)
10 A1 --- f_Name [a] Target not in kinematic sample (1)
12- 17 F6.4 --- z [0.021/0.0992] SDSS-DR7 redshift
19- 23 F5.1 Mpc Dist Luminosity distance (2)
25- 28 F4.2 kpc/arcsec Scale Scale in based on redshift and adopted
cosmology
30- 31 I2 h RAh Hour of right ascension (J2000)
33- 34 I2 min RAm Minute of right ascension (J2000)
36- 40 F5.2 s RAs Second of right ascension (J2000)
42 A1 --- DE- Sign of declination (J2000)
43- 44 I2 deg DEd Degree of declination (J2000)
46- 47 I2 arcmin DEm Arcminute of declination (J2000)
49- 52 F4.1 arcsec DEs Arcsecond of declination (J2000)
54- 61 F8.4 deg PA Position angle
63- 66 I4 s Exp [300/4200] Exposure time
68- 78 A11 "YYYY/MMM/DD" Date Observation date
80- 82 A3 --- Cor [yes no] FeII correction?
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Note (1): Could not measure σ - not in kinematic sample.
Note (2): Luminosity distance based on redshift and adopted cosmology
(H0=70km/s/Mpc, ΩΛ=0.7, and ΩM=0.3).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Target name (HHMM+DDMM; J2000)
11- 15 F5.1 pix-1 S/N Signal to noise ratio (1)
17- 19 I3 km/s Ssig Velocity dispersion at the Sloan fiber radius (2)
21- 22 I2 km/s e_Ssig Ssig uncertainty
23- 24 A2 --- f_Ssig [abc* ] Flag on Ssig (3)
26- 28 I3 km/s Sig Best velocity dispersion (4)
30- 31 I2 km/s e_Sig Sig uncertainty
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Note (1): S/N per pixel is calculated from rest-frame 8480-8690Å
(5050-5450Å if measurement is from CaHK or MgIb).
Note (2): Our best raw measurement at the Sloan fiber radius. Here if CaT could
not be used, we report CaHK; if CaHK was also unavailable, we report
MgIb. If AGN contamination contaminated all aperture spectra, we use
the spatially resolved spectrum closest to 1.5" with the same regional
preference. The result of this selection is noted by the superscripts.
Note (3): Flag as follows:
a = From CaHK;
b = from MgIb;
c* = from spatially resolved spectrum; farther than 0.5" from the Sloan radius.
Note (4): Our best measurement of σ for the target, with wavelength range
bias correction (from Section 5) and regional bias correction (from
Section 6) applied. Note that if the raw measurement came from
spatially resolved spectra, we apply the corrections derived from
spatially resolved spectra; otherwise we use aperture corrections.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Object name (HHMM+DDMM; J2000)
11- 15 F5.2 arcsec ROff ? Offset in Ca triplet (CaT) waveband (1)
17- 22 F6.2 km/s sCaT ? CaT region stellar velocity dispersion
24- 29 F6.2 km/s e_sCaT ? Error in sCaT
31- 35 F5.2 arcsec BOff ? Offset in CaH&K and MgIb wavebands (1)
37- 42 F6.2 km/s sMgIb ? MgIb region stellar velocity dispersion
44- 49 F6.2 km/s e_sMgIb ? Error in sMgIb
51- 56 F6.2 km/s sCaHK ? CaHK region stellar velocity dispersion
58- 62 F5.2 km/s e_sCaHK ? Error in sCaHK
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Note (1): Offsets of spatially-resolved spectrum from center.
The wavebands regions are:
* CaT (red) at λ8498,8542,8662Å
* MgIb (green) at λ5167,5173,5184 {A}
* CaHK (blue) at λ3969,3934Å
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History:
From electronic version of the journal
References:
Bennert et al. Paper I. 2011ApJ...726...59B 2011ApJ...726...59B
Bennert et al. Paper III 2015ApJ...809...20B 2015ApJ...809...20B
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Oct-2012